Brush-handle connection



J. F. PALMER.

BRUSH HANDLE CONNECTION.

PPLICATION FILED NOV 11 9 1,397,899, I I PatentedN0v.22,192 1.

l M W JFrEElEFicRPEflmEF UNlTED STATES PATENT OFFICE.

JOHN

BRUSH-HANDLE CONNECTION.

Application filed November 11, 1919.

" 22mg ccncer z:

i. JOHN FREDERICK I the Unite cl States, and co, in the county ofiiilvranlzce c of Wisconsin, have invented certain and usefulimprovements in Brush-Maudie Connections; and I do hereby declare thatthe following is a full. r. and exact ucscripticn thereof.

My invention relates to ew and useful improvements in brush iandleconnections particularly of that resilient type whereiii the desiredspring action is procured bv a stiff coil spring forming the juncturebetween the inner end of the handle and a shank section or the brushhead.

It is in general the object of my invention to simplify and otherwiseimprove the structure and to incr use the etliciency and convenience ofmanipulation aiiorded by this type of connection.

It ishmore p-art'cularly my object to provide a connection or thischaracter wherein the convolutions of the coil spring employed to impartresiliency thereto, are directly e na it with the opposed ends or" theliaiidle and the shank of the brush head to provide a screw threadsecurement in a structure of max mum simplicity and conseq ent econoin Ithe frictional grip procured bv the resilience of the thread-torminc'coni'olutions serving to prevent possible ec idental unthrcadingmovement.

It is further my object to provide an exceedingly simple attaching headwhich may be adjustabl :ecured to the usual elongated wooden head blocl:of the brush.

With the above and other objects and advantages in view, which will beapparent as the description proceeds, my invention resides in the novelfeatures of constructlon, combination and arrangement of the parts ashereinafter described and defined by the appended claim.

In the accompanying drawings Figure l is a transverse sectional viewthrough a brush and improved handle connection therefor.

Fig. 2 is a plan view of the central portion bf the brush block.

Fig. 3 is a bottom view of the attaching head tor the connection.

Fig. a: is a view similar to Fig. 1, but showing a modified means ofsecuring the handle shank to attaching head.

Referring now more particularly to the Specification of Letters Patent.

Patented Nov. 22, 1921.

Serial No. 337,135.

accompanying drawings my improved handle connection is associated in thepresent instance with a brush of that type comprising an elongatedwooden head block 5 carrying the body of bristles 6, and my improvedhandl connection includes an attaching head in the form of a circularplate 7 centrally apertured for the reception of a bolt 8 passed throughthe brush block 5. To hold the attaching head in various relativelyadjusted positions on the bolt 8, the upper face of the brush block isprovided with a series of grooves 9 radiating from the bolt, and theperipheral portion of the bottom face of the attaching head plate 7 isprovided with a corresponding series of depending projections 10selectively engageable in the grooves 9, the various projections andgrooves of the series being equally spaced apart. A wing nut 11 isthreaded on the up per end of the bolt 8 and engages the head plate 7 tohold the projections in the grooves.

A shank section 12 projects obliquely upward from the head plate 7 atone side of its bolt aperture and the upper end of the shank section isslightly enlarged and provided with a series of threads 13. A heavyhelical coil spring 1% forms a spring juncture between the shank and thebrush handle 15 and the lower end of this coil spring is threaded on theupper end of the shank, the threads of the shank having slightly greaterdiameter than the internal diameter of the coil spring, whereby theconvolutions of the coil spring are slightly expanded as they areengaged on the shank, thus procuring an exceedingly tight "frictionalgrip which serves to positively prevent any tendency of looseness oraccidental unthreading movement. Likewise, the handle 15 is forced withthreading movement into the convolu: tions of the upper end of the coilspring, thus slightly expanding the convolutions and the threads of thehandle are cut as the handle is forced into the coil, thus highlycompressing the wood of the handle end and procuring a securement whichis very permanent under constant stresses to which the connection wouldbe subjected in use of the brush. The opposed ends of the brush handleand shank are beveled to facilitate their insertion in the coil and areslightly spaced apart to permit the necessary spring fiexure ot' thecoil.

I have thus provided an exceedingly simple and efiicient springconnection by reason of utilizing the convolutions of the coil spring toprocure direct threaded connection with the handle and the shank of theattaching head, the resiliency of the coil spring being also utilized toprocure an exceedingly tight frictional grip in the connection byexpansion of the convolutions of the spring upon insertion of themembers therein. The intermediate portion of the coil spring is,however, not placed under tension by transverse expansion of theconvolutions, and thus is free to permit the desired resilient yieldingaction between the handle and brush head. By forming the projections 10of the head plate 7 only at the peripheral portion of said plate apositive biting action of the projections in the grooves is procured bythe clamping pressure of the bolt 8, preventing the projections fromtending to work out of the grooves and from crushing the sides of thegrooves.

In Fig. 4-, I have shown a modified structure wherein the attaching headplate 7 carries a simple socket member 16 for receiving the handle shank15, thus eliminating for certain conditions of use the spring actionprocured in the afore described structure,

and providing a connection which is rota-' tably adjustable on a brushby reason of the bolt 8 and projections 10 as heretofore recited.

While I have shown and described preferred embodiments of my invention,it will be appreciated that various changes and modifications ofstructure may be employed to meet differing conditions of use andmanufacture, without departing in any manner from the spirit of myinvention.

W' hat is claimed is:

A brush handle connection comprising an attaching head, a shank extendedtherefrom and provided with a series of screw threads, a helical coilspring having its convolutions at one end portion engaged with thethreads of the shank, a handle having its inner end portion providedwith screw threads and forced into the other end of the coil spring withthreaded movement, the radius of ourvature of the threads on said shankand handle being uniform and slightly larger than the normal radius ofcurvature of the convolutions of the spring, whereby the latter isforcibly expanded upon threaded engagement with said shank and handlethus securing a strong and uniform frictional grip thereon, the ends ofthe shank and handle beyond the threaded portion being tapered to permitready insertion thereof in the spring and having flat extremities whichare nearly in contactwhen the device is as sembled, whereby an initialfiexure of the handle causes only a lateral tension of the spring but acontinued flexure of the same causes the spring to be stretchedlongitudinally.

In testimony that I claim the foregoing I have hereunto set my hand atMilwaukee, in the county of Milwaukee and State of Wisconsin.

J. FREDERICK PALMER.

